Haven't found vehicle data for London's congestion charge zone, but I did recall this pleasing animation of Boris bike movements. They're not quite as strongly everybody-in/everybody-out as the Oyster card data, but the Waterloo and Kings Cross stations in particular light up like beacons. This earlier animation visualises the journeys in a much less abstract way and again Waterloo and Kings Cross show strongly, Paddington too. Euston, curiously, is much less vivid. You'd think all those people coming in from Milton Keynes would be happy to cycle. Maybe it's just a lack of availability, Euston doesn't have the big stands they have at Waterloo.

In other mass transit news, The Times described the Circle Line tube as "a form of mild torture which no person would undergo if he could conveniently help it". In 1884. Thanks to the QI Elves for that.